Aryl Fluoroalkyl Sulfoxides: Optical Stability and p
<i>
K
<sub>a</sub>
</i>
Measurement
作者:Amélia Messara、Nicolas Vanthuyne、Patrick Diter、Mourad Elhabiri、Armen Panossian、Gilles Hanquet、Emmanuel Magnier、Frédéric R. Leroux
DOI:10.1002/ejoc.202100816
日期:2021.9.24
properties of chiral aryl fluoroalkyl sulfoxides with strong synthetic potential were studied. After resolution by enantioselective chromatography, their optical stability was investigated by thermal enantiomerization via enantioselective chromatography. Their ΔG values range from 38.2 to 41.0 kcal mol−1 at 214 °C. In addition, the pKa values of six aryl difluoromethyl sulfoxides were determined via
研究了具有强大合成潜力的手性芳基氟代烷基亚砜的关键性质。通过对映选择性色谱拆分后,通过对映选择性色谱的热对映异构化来研究它们的光学稳定性。它们的 Δ G值在 214 °C 时为 38.2 至 41.0 kcal mol -1。此外,六种芳基二氟甲基亚砜的 p K a值是通过 DMSO 中的间接紫外-可见分光光度滴定法测定的,其范围为 20.3-22.5。
Nucleophilic Difluoromethylation of Primary Alkyl Halides Using Difluoromethyl Phenyl Sulfone as a Difluoromethyl Anion Equivalent
作者:G. K. Surya Prakash、Jinbo Hu、Ying Wang、George A. Olah
DOI:10.1021/ol048166i
日期:2004.11.1
efficient nucleophilic difluoromethylation of primary alkyl halides has been disclosed through a novel nucleophilic substitution-reductive desulfonylation strategy, usingdifluoromethylphenylsulfone as a difluoromethyl anion ("CF(2)H(-)") equivalent.
An Efficient Preparation of New Sulfonyl Fluorides and Lithium Sulfonates
作者:Fabien Toulgoat、Bernard. R. Langlois、Maurice Médebielle、Jean-Yves Sanchez
DOI:10.1021/jo701318n
日期:2007.11.1
polyfluoroalkanesulfonyl fluorides is reported. This method, based on the synthesis of polyfluoroalkyl trimethyl silanes (precursors of polyfluoroalkylsulfinates) as intermediates, allows the successive transformations to be carried out in one pot. Moreover, these sulfonyl fluorides can be obtained from the corresponding sulfinates by electrophilic fluorination. This original approach avoids isolation and purification
报道了几种多氟链烷磺酰氟的有效制备方法。该方法基于多氟烷基三甲基硅烷(多氟烷基亚磺酸盐的前体)作为中间体的合成,可以在一个罐中进行连续的转化。而且,这些磺酰氟可以通过亲电氟化从相应的亚磺酸盐获得。这种原始方法避免了某些热或水解不稳定中间体的分离和纯化。因此,已经从卤代二氟甲基化的前体RCF 2 X(X = F,Br; R = ArC(O),ArS(O)n(CF 2)m ; n = 0,1,2; m制备了一系列新的磺酰氟。 = 1、2),并已转化为相应的磺酸锂,它们有潜力用作锂电池的电解质。
Oxydifluoromethylation of Alkenes by Photoredox Catalysis: Simple Synthesis of CF<sub>2</sub>
H-Containing Alcohols
developed a novel and simple protocol for the direct incorporation of a difluoromethyl (CF2 H) group into alkenes by visible-light-driven photoredoxcatalysis. The use of fac-[Ir(ppy)3] (ppy=2-pyridylphenyl) photocatalyst and shelf-stable Hu's reagent, N-tosyl-S-difluoromethyl-S-phenylsulfoximine, as a CF2 H source is the key to success. The well-designed photoredox system achieves synthesis of not only β-CF2
作者:G. K. Surya Prakash、Csaba Weber、Sujith Chacko、George A. Olah
DOI:10.1021/ol070195g
日期:2007.5.1
A new electrophilic difluoromethylating reagent has been developed. The S-(difluoromethyl)diarylsulfonium tetrafluoroborate has been shown to be effective for the introduction of an electrophilic difluoromethyl group into the following nucleophiles: sulfonic acids, tertiary amines, imidazole derivatives, and phosphines. The reagent failed to transfer the difluoromethyl group to phenols, carbon nucleophiles